Did you ever thought about links from sites like Facebook and twitter affect your sites PageRank or not! or You were busy making social connection out of those site. If you were then that is not bad. After all those are great sites for building social relationship and get loyal customers.
Even you were busy building social link with customers, it is good to know now that those links equally count to your Google page rank. Though Facebook's most of the page can private and Google cannot crawl to see if they have link to your site. Twitter's most of the link are no-follow according to Matt. So, generally twitter links may not be counting to your SEO work. Anyway you may have seen that Twitter translate those link into short URL. More to know from the video: